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Numerical Study on NO Formation in a Pulverized Coal-Fired Furnace Using Oxy-Fuel Combustion

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Cleaner Combustion and Sustainable World (ISCC 2011)

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Abstract

Computational fluid dynamics (CFD) approach was employed to numerically investigate NO formation in a 600 MW wall-fired pulverized coal-fired furnace retrofitted for oxy-coal combustion, aimed at the impacts of flue gas recycle ratio, O2 staging and recycled NO with the recycled flue gas (RFG) on NO formation and emission. An in-house CFD research code for conventional air combustion was developed and extended to simulate O2/RFG combustion with specific considerations of the change of gas properties and its impact on coal particle combustion processes. The extended De Soete mechanisms including NO reburning mechanism were applied to describe transformations of fuel nitrogen. It was shown that CFD simulation represented the significant reduction of NO formation during O2/RFG combustion compared to that during air combustion. The in-burner and particularly the in-furnace O2 staging were confirmed still to play very important roles in NO formation control. Changing the recycle ratio had significant impact on the combustion performance and consequently on NO formation and emission. With the combustion performance ensured, decreasing the flue gas recycle ratio or increasing the inlet O2 concentration of combustion gas led to reduction of NO formation and emission. Although NO formation and emission was found to increase with increasing the inlet NO concentration of combustion gas, CFD simulation indicated that ~74% of the inlet NO was reduced in the furnace, consistent with the experimental data reported in the literature. This demonstrated the significant contribution of reburning mechanism to the reduction of the recycled NO in the furnace.

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Acknowledgement

This work was partial supported by the Foundation of State Key Laboratory of Coal Combustion (FSKLCC0905) and the Natural Science Foundation of China (No.29936090).

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Authors and Affiliations

  1. School of Energy and Environment, Southeast University, Nanjing, 210096, China

    Aiyue Zhang, Yuan Chen & Changdong Sheng

Authors
  1. Aiyue Zhang
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  2. Yuan Chen
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  3. Changdong Sheng
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Correspondence to Changdong Sheng .

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Editors and Affiliations

  1. Institute of Thermal Engineering, Tsinghua University, Beijing, China, People's Republic

    Haiying Qi

  2. Institute of Thermal Engineering, Tsinghua University, Beijing, China, People's Republic

    Bo Zhao

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Zhang, A., Chen, Y., Sheng, C. (2013). Numerical Study on NO Formation in a Pulverized Coal-Fired Furnace Using Oxy-Fuel Combustion. In: Qi, H., Zhao, B. (eds) Cleaner Combustion and Sustainable World. ISCC 2011. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-30445-3_126

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  • DOI: https://doi.org/10.1007/978-3-642-30445-3_126

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-30444-6

  • Online ISBN: 978-3-642-30445-3

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